Gravity door-lock



No. 621,898. Patented Mai. 28, I899.

J. H. CANADAY. I

GRAVITY DOOR LOCK.

(Application filed May 27, 1898.)

(No Model.)

lnvezziaf 0266mm W W GRAVITY DOOR-LOCK.

SPECIFICATION forming part of Letters P atent No. 621,898, dated March 28,1899.

A li ti fil d May 27, 1898. Serial No. 681,964. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOEL H'. OANADAY, of Elsinore, Allen county, Kansas, have invented certain new and useful Improvements in Gravity Door-Locks, of which the followingis a specification.

My invention relates to sprin gless or gravity door-locks 5 and my object is to produce a lock of this character which as long as the key is fitted therein cannot be unlocked by a person at the side of the door opposite to the key.

A further object is to provide a lock provided with a single boltviz. the latchbolt with which to secure the door in its closed position.

A still further object is to provide a looking dog or tumbler which is set by means of the key and secures the latch-bolt in its advanced position after the key is removed and which cannot be unset without a suitable key.

The invention consists in certain novel and peculiar features of construction and combinations of parts, as will be hereinafter described and claimed; and in order that the invention may be fully understood I will proceed to describe it with reference to the accompanying drawings, in which- Figure 1 is a face view of the lock with the usual face or cover plate omitted. Fig. 2 represents perspective views, detached, of the gravity-tumbler and the combined latch and locking bolt.

The loc'k-casin g illustrated is of that type which is to be set in theedge of the door; but of course the operating mechanism is not restricted to use in connection with this type of casing, but may be used in connection with any style of easing adapted for its reception.

In said drawings, 1 designates the casing, provided with the customary opening to receive the barrel or sleeve 2, said barrel or sleeve being 'journaled in the casing in the customary manner and provided with a pair of upwardly-diverging arms 3 4. I The rectangular stem 5 is fitted in said barrel in order that a person by grasping the knob (not shown) at either end may turn the barrel and through the medium of parts to be presently described retract the latch-bolt 7 preliminary to the opening of the door, said latchbolt projecting through the front plate of the lock in the customary manner and of the reversible type in order thatit may be used upon a door opening either to the left or to the right. projecting stem of said latch-bolt is a rigid pin 8, projecting inwardly from the back wall of the casing, and mounted pivotally upon the same is a tumbler in the form of a bellcrank lever. Said lever is inverted, so that its front arm 9 shall fit snugly between the back'plate and the stem of the latch-bolt, and is provided with a rigid pin 10, pivotally engaging the circular opening 11 of said stem. The opposite arm 12 of said bell-crank lever projects rearwardly with respect to the edge of the door and is provided with a substantially triangular-shaped enlargement 13, the incline or cam face 14 of which is adapted for engagement with the arm 3 of the knobsleeve, the opposite incline or cam face 15 being adapted for engagement with the companion arm 4, projecting from said knobsleeve, to the end that the rotatable operation of said sleeve in either direction shall cause the operation of the bell-crank, and thereby retract the latch-bolt within the casing that the door may be opened. By this arrangement it is obvious that said bell-crank lever by gravity alone positively insures the advancement of the latch-bolt, whether the door be open or closed, except at such times as it is retracted by the manipulation of the doorknob.

The notching of the arm 12 of the bell-crank, as shown, provides, in addition to its camfaces 14 and 15, an abrupt shoulder 16, for a purpose which will presently appear. The crotch or angle formed by and between the arms of said bell-crank tumbler registers with the keyhole 17, as shown clearly in Fig. 1, and j ust rearward of the crotch or angle a pin 18 projects rigidly from the arm 12, and mounted pivotally thereon is a locking dog or tumbler, said (log or tumbler comprising the long upwardly-projecting arm 19 and the short downwardly-projecting arm 20. This dog or tumbler extends at a tangent to the keyhole-opening irrespective of its position relative to the gravity-tumbler, and consequently is always in position to be engaged by .the key, which is adapted to act alternately on the long arm 19 to throw it to the About vertically over the inwardly-- position illustrated by dotted lines, Fig. 1, against shoulder 16 or, by engagement with the short arm 20, from the position illustrated by dotted lines back to the position illustrated in full lines until said short arm by engaging the cam-face 1+1 limits such movement of the dog.

\Vhen the dog or tumbler is in the position illustrated by dotted lines, it is obvious that gravity tends to hold it in such position; but owing to the fact that its upper end is adjacent to the top wall of the casing it will-be impossible by turning the knob to retract the lateh-bolt (now also the locking-bolt) within the casing. On the other hand, when it occupies the position shown in full lines its upper end is adjacent to the pivot of the bellcrank tumbler, and consequently does not prevent the weighted end of the bell-crank rising under the rotatable action of the knobsleeve. This action of course retracts the latch-bolt, and the door may be opened.

In Fig. 1 the key 21 is shown in the lock, and owing to the fact that its shank intercepts the path of movement of the arm 9 of the bell-crank tumbler it is obvious that the latch cannot possibly be retracted until said key is removed. Consequently it is clear that as long as the key remains in the lock the door cannot be opened, and it is unnecessaryto dispose the locking dog or tumbler in the position indicated by dotted lines, Fig. l-viz., its locking position. It is apparent, therefore, if the house occupants desire the door to remain unlocked the key must be removed and should for convenience be hung upon a nail or carried in the pocket. As the removal of the key, however, in some cases would necessitate the exercise of more or less care in its proper disposition to prevent loss, the arm 9 of the bell-crank tumbler may be provided with a slot or notch, as shown at 22, Fig. 2, concentric to the pivot S and opening into the crotch or angle of said tumbler to the end that said slot or notch may receive the shank of the keyin the lock as the latchbolt is retracted by the customary manipulation of the door-knob. In case this tumbler should be provided with a concentric slot or notch it is obvious that the key would lose its locking function by preventing the pivotal operation of said tumbler. In this case, therefore, the door can be lockedsolely by the said locking dog or tumbler.

From the above description it is obvious that I have produced a door-lock which embodies the features of advantage enumerated as desirable in the statement of the invention, and it is to be understood, of course, that I reserve the right to make such changes as come within the spirit-and scope of the invention.

Having thus described the invention, what I claim as new, and desire to secure byLetters Patent, is p 1. A door-lock, comprising a suitable casing, a sliding latch-bolt, a rotatable knobsleeve provided with upwardly projecting arms, an inverted bell-crank tumbler pivoted in the casing and to the stem of said latchbolt, and formed with an enlargement having cam-faces, and having its crotch or angle registering with the keyhole-opening of the door, and a pivoted locking dog or tumbler carried by the bell-crank tumbler, and adapted, by engagement with the top wall of the casing, to prevent the withdrawal of the latch-bolt, substantially as described.

2. A door-lock, comprising a suitable casing, a sliding latch-bolt, a rotatable knobsleeve provided with upwardly projecting arms, an inverted bell-crank tumbler pivoted in the casing and to the stem of said latchbolt, and formed with an enlargement having cam-faces and a shoulder, and having its crotch or angle registering with the keyl1oleopening of the door, a locking dog or tumbler pivoted to the bell-crank tumbler, and provided with an upwardly-projeetin g arm adapted for engagement with said shoulder and the top wall of the bolt-casing, and a depending arm adapted for engagement with one of said cam-faces; the engagement of said arms with said parts taking place alternately, and means to pivotally operate said (leg or tumbler in one direction or the other, substantially as described.

3. A door-lock, comprising a suitable casing, a sliding latch-bolt, a rotatable knobsleeve provided with upwardly-projecting arms,an inverted bell-crank tumblerpivoted in the casing and to the stem of said latchbolt, and formed with an enlargement having cam-faces and a shoulder, and having its crotch or angle registering with the keyholeopening of the door, and provided with a central slot in advance of and registering with said keyhole-opening, a locking dog or tumbler pivoted to the bell-crank tumbler, and provided with an upwardly-projecting arm adapted for engagement with said'shoulder and the top wall of the lock-casing, and a depending arm adapted for engagement with one of said cam-faces; the engagement of said arms with said parts taking place alternately, and means to pivotally operate said dog or tumbler in one direction or the other, substantially as described.

In testimony whereof I aflix my signature in the presence of two witnesses.

JOEL II. CANADAY.

\Vitnesses:

G. Y. THORPE, M. R. REMLEY. 

